Inthepast,mandidnothavetothinkabouttheprotectionofhisen...
問題詳情:Inthepast,mandidnothavetothinkabouttheprotectionofhisenvironment.Therewerenotmanypeopleonearth,andnaturalresources(資源)seemedtobeunlimited(無限的).Today,thingsaredifferent.Theworldhasbecometoocro...